Description: Replace the legacy __sync built-in functions with __atomic ones

 libunwind uses the built-in __sync_* functions which are deprecated by GCC and

 should be replaced by __atomic_* ones. See the official manuals [1].

 .

 The legacy __sync functions do not require to specify the memory order but

 __atomic ones do, so we choose the strongest one: __ATOMIC_SEQ_CST.

 .

 We do this because __sync_fetch_and_add() is not supported on armel.

 .

 [1]: https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html

Author: Kai-Chung Yan ()

Last-Update: 2016-10-04

--- a/include/libunwind_i.h

+++ b/include/libunwind_i.h

@@ -155,8 +155,8 @@

   u.vp = addr;

   return __sync_bool_compare_and_swap(u.vlp, (long) old, (long) new);

 }

-# define fetch_and_add1(_ptr)		__sync_fetch_and_add(_ptr, 1)

-# define fetch_and_add(_ptr, value)	__sync_fetch_and_add(_ptr, value)

+# define fetch_and_add1(_ptr) __atomic_fetch_add(_ptr, 1, __ATOMIC_SEQ_CST)

+# define fetch_and_add(_ptr, value) __atomic_fetch_add(_ptr, value, __ATOMIC_SEQ_CST)

 # define HAVE_CMPXCHG

 # define HAVE_FETCH_AND_ADD

 #endif